Seven large power supplies (LGPS) with output ratings from 72kW to 270kW power PEP-II quad magnets in the electron-positron collider region. These supplies have posed serious maintenance and reliability problems since they were installed in 1997, resulting in loss of accelerator availability. A redesign/rebuild program was undertaken by the SLAC Power Conversion Department. During the 2004 summer shutdown all the control circuits in these supplies were redesigned and replaced. A new PWM control board, programmable logic controller, and touch panel have been installed to improve LGPS reliability, and to make troubleshooting easier. In this paper we present the details of this rebuilding program and results.
This paper discusses the development of a solid state replacement for the L-4888 thyratron, which is presently used in the eighty-three high-power klystron modulators of SLAC's Linac Coherent Light Source (LCLS). The motivations are to improve modulator performance, increase availability and decrease operational costs. The solid state switch is based on an array of SGTO thyristors. The challenging dI/dt (10 kA/μs), peak power (150 MW), and average power (100 kW) requirements of this application differentiate this work from prior solid state thyratron replacement efforts. Herein, are described the application (including system specifications), the present development status (demonstrated performance and reliability), as well as future development plans.
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